fix(dns): Fix some remaining issues with monitoring

This patch fixes the current issues with Service Discovery by adding a
port to the service with the correct name for the ServiceMonitor, as
well as adding the missing network policy.

apps/k8s01/dns/dns.yaml

@@ -182,6 +182,10 @@ spec:
       protocol: TCP
       port: 80
       targetPort: 80
+    - name: metrics
+      protocol: TCP
+      port: 8080
+      targetPort: 80
 ---
 apiVersion: policy/v1
 kind: PodDisruptionBudget

apps/k8s01/dns/kustomization.yaml

@@ -8,4 +8,7 @@ resources:
   - networkpolicy.yaml
   - servicemonitor.yaml
   - ../../../shared/networkpolicies/allow-from-same-namespace.yaml
+  - ../../../shared/networkpolicies/allow-from-monitoring.yaml
   - ../../../shared/resourcequotas/default.yaml
+patchesStrategicMerge:
+  - networkpolicy-patch.yaml

apps/k8s01/dns/networkpolicy-patch.yaml

+---
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-from-monitoring
+spec:
+  podSelector:
+    matchExpressions:
+      - key:  app
+        operator: In
+        values:
+          - resolver
\ No newline at end of file

apps/k8s01/dns/servicemonitor.yaml

@@ -10,5 +10,5 @@ spec:
     matchLabels:
       app: resolver
   endpoints:
-    - port: http
+    - port: metrics
       path: /metrics